The cylinder head is cast aluminum alloy with pressed cast iron seats and valve guides. The upper part of the bushings is sealed with metal-rubber oil deflector caps 3 (pic. 2-41).
Pic. 2-41. Section of the cylinder head on the exhaust valve:
1 - cylinder head; 2 - valve; 3 - oil deflector cap; 4 - valve lever; 5 - camshaft bearing housing; 6 - camshaft; 7 - adjusting bolt; 8 - adjusting bolt locknut; A - the gap between the lever and the camshaft cam.
As spare parts, guide bushings are supplied with an outer diameter increased by 0.2 mm.
A bearing housing 5 is fixed on the cylinder head, in which the camshaft 6 is located.
Valve drive mechanism
The valves 2 are actuated by the camshaft cams through the levers 4. At one end, the lever presses on the valve stem, and at the other end it rests on the spherical head of the adjusting bolt 7, which regulates clearance A in the valve mechanism.